Pressure reducing valve of expansion water tank

Abstract

The utility model provides an expansion tank pressure reducing valve which comprises a valve cover, a valve body and a bottom cover which are sequentially and fixedly connected from top to bottom, an adjusting rod is vertically arranged at the upper end of the valve cover in a penetrating mode, a main spring is installed in the valve cover and controlled by the adjusting rod to stretch out and draw back, a wave-shaped diaphragm is arranged between the valve cover and the valve body, and a pressing ring is fixedly arranged in the center of the diaphragm. An ejector rod vertically penetrates through the center of the valve body, the upper end of the ejector rod is in threaded connection with the pressing ring, a valve seat, a valve seat spring and a filter element are arranged in the bottom cover, the filter element is fixed between the valve body and the bottom cover, and the lower portion of the valve seat is elastically connected with the upper end of the bottom cover through the valve seat spring; the corrugated diaphragm pressure reduction structure is arranged, the risk that the diaphragm is pulled apart is avoided through abundant deformation of the diaphragm, the main spring is pressed downwards through the adjusting rod, the valve seat spring is pressed downwards through the valve seat, double pressure reduction is achieved, pressure change is hindered and weakened, and outlet pressure is stabilized.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a pressure reducing valve for an expansion tank. Background Technology

[0002] Currently, pressure-reducing valves used in water systems generally employ spring-piston or spring-diaphragm structures, with the spring playing a crucial role in the valve's performance. However, spring manufacturing is quite complex. It requires materials with high fatigue limits, yield points, sufficient impact toughness, excellent hardenability, low overheat sensitivity, and resistance to decarburization, and also necessitates a sophisticated heat treatment process. Therefore, spring manufacturing is challenging, making it difficult to guarantee quality and lifespan. Furthermore, prolonged exposure to alternating stress inevitably leads to a decline in the spring's stiffness and other mechanical properties, eventually requiring replacement. Summary of the Invention

[0003] The purpose of this invention is to provide a pressure reducing valve for an expansion tank.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An expansion tank pressure reducing valve is characterized by comprising a valve cover, a valve body, and a bottom cover fixedly connected vertically. An adjusting rod is vertically inserted through the upper end of the valve cover. A main spring is installed inside the valve cover, and its extension and retraction are controlled by the adjusting rod. A wave-shaped diaphragm is provided between the valve cover and the valve body, and a pressure ring is fixedly installed in the center of the diaphragm. A top rod is vertically inserted through the center of the valve body, and the upper end of the top rod is threadedly connected to the pressure ring. A valve seat, a valve seat spring, and a filter element are provided inside the bottom cover. The filter element is fixed between the valve body and the bottom cover. The lower part of the valve seat is elastically connected to the upper end of the bottom cover via the valve seat spring.

[0006] Furthermore, the upper end of the adjusting rod is provided with an adjusting ring, which is fitted onto the outer side of the upper end of the valve cover, and the adjusting rod and the adjusting ring are connected by pan head screws.

[0007] Furthermore, the pressure ring includes an upper pressure ring and a lower pressure ring. The upper pressure ring is located at the upper end of the diaphragm, and the lower pressure ring is embedded in the central hole of the diaphragm and the upper pressure ring. The push rod passes through the lower pressure ring vertically.

[0008] Furthermore, an adjusting nut is sleeved on the outer side of the adjusting rod, and the adjusting nut limits the upper end of the main spring.

[0009] This invention features a waveform diaphragm pressure-reducing structure. By allowing the diaphragm to deform sufficiently, the risk of the diaphragm breaking is avoided. Furthermore, by pressing down the main spring with the adjusting rod and the valve seat spring with the valve seat, a double pressure reduction is achieved, hindering and weakening pressure changes and stabilizing the outlet pressure. Attached Figure Description

[0010] Figure 1 This is a side sectional view of the present invention;

[0011] Figure 2 This is a diagram of the external structure of this utility model.

[0012] Figure label:

[0013] 1. Bottom cover, 2. First O-ring, 3. Valve body, 4. Secondary sealing seat, 5. Lower pressure ring.

[0014] 6. Diaphragm, 7. Upper pressure ring, 8. Valve cover, 9. Main spring, 10. Adjusting ring, 11. Gasket

[0015] 12 Pan head screw, 13 Adjusting rod, 14 Adjusting nut, 15 Push rod, 16 Valve seat

[0016] 17 Second O-ring, 18 Valve seat spring, 19 Filter element, 20 Socket head cap screw,

[0017] 21. Pressure gauge. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] This embodiment discloses an expansion tank pressure reducing valve, such as Figure 1 As shown, it includes a valve cover 8, a valve body 3, and a bottom cover 1 that are fixedly connected in sequence from top to bottom. The valve body 3 and the bottom cover 1 are sealed by a first O-ring 2.

[0020] An adjusting rod 13 is vertically inserted through the upper end of the valve cover 8. A main spring 9 is installed inside the valve cover 8. An adjusting ring 10 is provided at the upper end of the adjusting rod 13. The adjusting ring 10 is sleeved on the outer side of the upper end of the valve cover 8. The adjusting rod 13 and the adjusting ring 10 are connected by a pan head screw 12. A washer 11 is provided between the pan head screw 12 and the adjusting ring 10. The washer 11 is limited in the annular groove at the upper end of the adjusting ring 10. An adjusting nut 14 is sleeved on the outer side of the adjusting rod 13. The adjusting nut 14 limits the upper end of the main spring 9, so that the adjusting rod 13 can control the extension and retraction of the main spring 9.

[0021] A corrugated diaphragm 6 is provided between the valve cover 8 and the valve body 3, and a pressure ring is fixed in the center of the diaphragm 6, such as... Figure 1 As shown, the pressure ring includes an upper pressure ring 7 and a lower pressure ring 5. The upper pressure ring 7 is located at the upper end of the diaphragm 6, and the lower pressure ring 5 is embedded in the central hole of the diaphragm 6 and the upper pressure ring 7. The push rod 15 passes through the lower pressure ring 5 vertically.

[0022] A top rod 15 is vertically inserted through the center of the valve body 3. The upper end of the top rod 15 is connected to the pressure ring by a thread. The upper end of the top rod 15 and the pressure ring are sealed by a secondary sealing seat 4. The bottom cover 1 is provided with a valve seat 16, a valve seat spring 18 and a filter element 19. The filter element 19 is fixed between the valve body 3 and the bottom cover 1. The lower part of the valve seat 16 is elastically connected to the upper end of the bottom cover 1 by the valve seat spring 18. The valve seat 16 and the bottom cover 1 are sealed by a second O-ring 17.

[0023] In the initial state, such as Figure 1 As shown, fluid enters the internal cavity of valve body 3 from the inlet pipe on the left side of valve body 3, is filtered by filter element 19 and remains outside valve seat 16. In the initial state, valve seat 16 is lifted by valve seat spring 18 and tightly cooperates with the upper end of valve body 3, sealing the outlet pipe of valve body 3.

[0024] During operation, the operator rotates the adjusting ring 10, which causes the adjusting rod 13 to rotate, pressing the main spring 9 downward. The main spring 9 pushes the diaphragm 6 downward, and the push rod 15 moves down synchronously with the diaphragm 6. The valve seat 16 is pushed down by the push rod 15 and moves away from the upper end of the valve body 3. The outlet pipe on the right side of the valve body 3 opens, and the fluid can flow out from the outlet pipe.

[0025] like Figure 2 As shown, pressure gauges 21 are installed in both the inlet and outlet pipes of the valve body 3, and the valve cover 8 and the valve body 3 are fixedly connected by annularly distributed internal hexagonal head screws 20.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An expansion tank pressure relief valve characterized by, The utility model relates to a valve, including upper and lower fixed connection in proper order valve cover (8), valve body (3) and bottom cover (1), the upper end of valve cover (8) is equipped with adjusting rod (13) along the vertical, the main spring (9) is installed in valve cover (8), the main spring (9) is controlled telescopic by adjusting rod (13), be equipped with corrugated diaphragm (6) between valve cover (8) and valve body (3), the central fixed of diaphragm (6) is equipped with pressure ring, the central of valve body (3) is equipped with top rod (15) along the vertical, the upper end of top rod (15) is connected through screw thread with pressure ring, be equipped with valve seat (16), valve seat spring (18) and filter core (19) in bottom cover (1), the filter core (19) is fixed between valve body (3) and bottom cover (1), the lower part of valve seat (16) is elastically connected through valve seat spring (18) with the upper end of bottom cover (1).

2. The pressure reducing valve for an expansion tank according to claim 1, wherein The upper end of adjusting rod (13) is equipped with adjusting ring (10), adjusting ring (10) is sleeved on the outside of the upper end of valve cover (8), adjusting rod (13) is connected with adjusting ring (10) through disc head screw (12).

3. The pressure reducing valve for an expansion tank according to claim 1, wherein The pressure ring includes upper pressure ring (7) and lower pressure ring (5), the upper pressure ring (7) is located in the upper end of diaphragm (6), the lower pressure ring (5) is embedded in the center hole of diaphragm (6) and upper pressure ring (7), top rod (15) is vertically through lower pressure ring (5).

4. The pressure reducing valve for an expansion tank according to claim 1, wherein The outside of adjusting rod (13) is sleeved with adjusting nut (14), adjusting nut (14) limits the upper end of main spring (9).

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